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Inventories (Tables)
12 Months Ended
Dec. 28, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories are comprised of the following (in thousands):
 
December 28,
2018
 
December 29,
2017
Raw materials
$
80,213

 
$
85,050

Work-in-process
75,711

 
63,620

Finished goods
34,152

 
28,068

Total
$
190,076

 
$
176,738